You have already stated your boundary as what you are willing to live with in your M. If you are not willing to enforce it, the boundary is meaningless.
If my dog tries to pee on the rug and I allow it, I have taught her it's okay. If I try to correct her after she's done and moved on, she won't know why I'm punishing her.
You should be ready to take action when you have evidence your W disrespected you and crossed the boundary. The longer you wait, you're teaching your W it's okay to pee on you.
